Net Income Per Share - Schedule of Basic and Diluted Net Income Per Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income	$ 62,890	$ 12,858	$ 203,725	$ 101,855
Denominator:
Weighted-average shares outstanding - basic (in shares)	198,600	193,237	197,680	193,203
Weighted-average shares outstanding - diluted (in shares)	203,124	201,861	202,729	202,837
Net income per share - basic (in dollars per share)	$ 0.32	$ 0.07	$ 1.03	$ 0.53
Net income per share - diluted (in dollars per share)	$ 0.31	$ 0.06	$ 1.00	$ 0.50
Common stock options
Denominator:
Potentially dilutive securities (in shares)	295	460	314	577
RSUs
Denominator:
Potentially dilutive securities (in shares)	2,981	4,165	3,359	4,062
2022 Warrants | Warrants
Denominator:
Potentially dilutive securities (in shares)	667	996	631	827
Partial settlement of 2022 Warrants (in shares)	0	485	68	963
2022 Notes | Convertible senior notes
Denominator:
Potentially dilutive securities (in shares)	556	1,258	539	1,148
Potentially dilutive securities (in shares)	25	1,260	138	2,057